WRA-YDV-3W&WRB-YDV-3W Series
OUTPUT SPECIFICATIONS
TYPICAL CHARACTERISTICS
Item
Test conditions
Min.
Typ.
Max.
O3
Units
W
Output power
See below products program
Refer to recommended circuit
Refer to recommended circuit
From 10% to 100% load
Input voltage from low to high
Refer to recommended circuit
20MHz Bandwidth
0.3
Positive voltage accuracy
Negative voltage accuracy
Load regulation
±1
±3
±3
%
±5
%
±0.45
±0.2
±1*
±0.5
±0.03
100
%
Line regulation
%
Temperature drift(Vout)
Ripple & Noise**
%/℃
mVp-p
KHz
50
Switching frequency
100% load, nominal input voltage
300
*Dual output models unbalanced load: ±5%.
**Test ripple and noise by “parallel cable”method. See detailed operation instructions at Testing of Power Converter section,
application notes.
RECOMMENDED CIRCUIT
COMMON SPECIFICATIONS
Item
Test conditions
Min.
Typ.
Max.
95
Units
%
Storage humidity
Operating temperature
Storage temperature
Temp. rise at full load
Lead temperature
No-load Power consumption
Cooling
-40
-55
85
℃
125
℃
15
℃
1.5mm from case for 10 seconds
300
℃
0.2
W
Free air convection
Short circuit protection
Case material
Continuous, Automatic Recovery
D: Plastic (UL94-V0); MD: Steel, Nickel Coated
MTBF
1000
K hours
g
Weight
15
APPLICATION NOTE
Requirement On Output Load
In order to ensure the product operate efficiently and reliably, in addition to a max load(namely full
load), a minimum load is specified for this kind of DC/DC converter. Make sure the specified range of input voltage is not
exceeded, the minimum output load no less than 10% load. If the actual load is less than the specified minimum
load, the output ripple may increase sharply while its efficiency and reliability will reduce greatly. If the actual output power
is very small, please add an appropriate resistor as extra loading, or contact our company for other lower
output power products.
Recommended Circuit
All the WRA_YDV-3W & WRB_YDV-3W Series have been tested according to the following recommended testing circuit
before leaving factory. This series should be tested under load. Never be tested under no load (see Figure 1).
If you want to further decrease the input/output ripple, you can increase capacitance properly or choose capacitors with
Output External Capacitor Table(Table 1)
Single Vout
Cout
(uF)
1000
680
Dual Vout
(VDC)
±5
Cout
(uF)
680
470
330
220
100
low ESR. However, the capacitance of the output filter capacitor must be proper. If the capacitance is too big,
a
startup problem might arise. For every channel of output, provided the safe and reliable operation is ensured, the
greatest capacitance of its filter capacitor sees (Table 1). Generally: If you want to use the products in high EMI, please choose
our metal packaged products (WRA_YDV-3W & WRB_YDV-3W). General:
(VDC)
5
Cin: 5V&12V
24V&48V 10µF-47µF
Cout: 10µF/100mA
100µF
9
±9
12
15
24
470
±12
330
±15
Input Current
When it is used in unregulated power supply, be sure that the fluctuating range of the power supply and the rippled
voltage do not exceed the module standard. Input current of power supply should afford the startup current of
this kind of DC/DC module (See figure 2), General:
220
±24
Ip ≤ 1.4*Iin-max
No parallel connection or plug and play
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Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646
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